Grinding or polishing machine.



F. N. GARDNER. GRINDING .OR POLISHING MAGHINE.

' APPLICATION FILED APR. 24,1907.

Patented May 4, 1909.

3 SHEETS-SHEET 1 P. N. GARDNER. GRINDING 0R POLISHING MACHINE.

APPLICATION PILBD'A'PR.24, 1907.

Patented May 4, 1909.

3 SHEETSSHBET 2.

F. N. GARDNER. GRINDING 0R POLISHING MACHINE.

Mm 2 m k j mm WC/M m IW m 7. Q Q m 9. w 5 J w w FREDERICK N. GARDNER, OFBELOIT, WISCONSIN.

GRINDING OR POLISHING MACHINE.

Specification of Letters Patent.

Patented May'4, 1909.

Application filed April 24, 1907. Serial No 369,932.

I To all whom it mai concern:

Be it known that I, FREDERICK N. GARD- NER, a citizen of the UnitedStates, residing at Beloit, in the county of Rock and State ofWisconsin, have invented certain new and useful Improvements in Grindingor Polishing Machines, of which the following is a specification.

The object of this invention is the production of an improved grindingor polishing machine.

The invention contemplates a machine comprising a plurality of grindingelements, and means for carrying an article successively into operativerelation with said grinding elements.

The invention also relates to a machine comprising a grinding element,and means for carr ing an article into operative relation with saldelement, the latter being arranged at an angle with relation to the lineof movement of the article.

The i vention further refers to a machine comprisi1g two opposinggrinding elements, and means for carrying an article through the spacebetween said elements, said elements being disposed at an angle withrelation to each other and to the line of travel ,of the article.

The embodiment herein illustrated of my invention is intended forgrinding the polygonal sides of nuts, cap-screw'heads or similararticles, and comprises a plurality of pairs of opposing grinding disksarranged to grind two opposite sides or faces of the article, the numberof pairs of grinding disks employed depending upon the number of facesto be ground.

The machine also comprises means for carrying the articles to be 0erated upon successively between the dis s of. each pair of grindingdisks, and means between each two successivepairs ofdisks for placingthe articles in position to be acted upon by the next succeeding pair.

In the accompanying drawings, Figure 1 is a side elevation, with artsbroken away, of-a grinding machine em odying the features of myinvention. Fig. 2 is an end elevationthereof. Fig. 3 is a partial topplan of the machine. Fig. 4 is a detail 'vlew of the article-positioningdevice. Figs. 5 and 6 are detail views of the article-holders.

In the embodiment selected for illustra-.

tion, the mechanism is supported upon a base cured three pairs of.brackets 2. Each of these brackets com rises a guide-way 3 havingoverhanging si e walls. In said guideway is slidably mounted a block 4having bearings 5 therein for rotatably supporting a shaft 6. Upon theinner end of said shaft is rigidly mounted a grinding disk 7, of anycommon or preferred construction, and between the bearings 5 said shaftcarries a drive pulley 8 arranged to be driven from a countershaft (notshown) supported above the machine, By reference to .the drawings, itwill be seen that the construction set forth provides a plurality, ofpairs of opposing grinding disks; To permit of adjusting the disks ofeach pair toward and away from each other I mount a screw 9 in bearings10 and 1 1 located at, opposite ends of the guide-way 3,v

said screw being provided at its outer end l with a crank 1 2 forturning it. Upon the screw 9 is a nut 13 having a stem 14 extendingthrough a bearing 15 in the block 4. The upper end of the stem isscrew-threaded to receive a nut 16. As will be seen, the rotation of thescrew 9 moves the grinding disk carried upon the block 4 attached tosaid screw toward or away from the opposite disk.

The articles to be operated upon are moved through the space between thegrinding disks of each pair, said disks being dis osed at an angle witheach other and wit the direction of travel of the articles to provide aV-shape space (Fig. 3) between them. In theirtravel through said space,

from the broad forward end to the narrow end thereof, two opposite facesof the'articles are ground off to the desired extent. The de th of thecut to be made by the grinding dis ks is re lated by adjusting theinclina tion of sai disks, the blocks 4 for this urose being pivotallymounted to swing in a horizontal plane upon the stems 14. Any suitablemeans may be provided for adjusting the angle of inclination of thedisks 7 and for locking them in the desired position. In the presentinstance, the means employed for this purpose comprises two lugs 17preferably fixed to or cast integral with the rackets 1 at one side ofthe guide way 3, said lugs having oppositely inclined or wedging faces.Upon opposite ends of the block 4, in position to bear against saidlugs, are mounted screws 18 having conical inner ends adapted to engagethe inclined faces of said lugs. As will be apparent, the angle at Ill)which the grinding disks 7 is laced with relation to the line of travel0 the article to be operated-u on may be ad'usted' by slackening one oft e screws 18 an screwing up the other, said screws also serving to.

each holder comprises a stud 22 upon whichthe nuts are pivotallymounted. Where it is desired to operate upon cap screws, holders havingan opening 23 therethrough to receive the body of the screw are used,the head of the screw resting upon the upper side of the holder.

The endless conveyer 19 is carried upon a driving sprocket wheel 24fixed upon a shaft 25 w 'ch is rotatably supported in bearings 26 at oneend of the base 1, and upon a Wheel 27 mounted'upon a shaft 28 runningin bearings 29 at the opposite end of said base. Theshaft 25 carries atone end a Worm wheel- 30 with which meshes a' worm-31 fixed upon theupper end of a vertical shaft 32 rotatably su ported in bearings 33. Onthe lower on of the shaft 32 is fixed a bevel gear wheel 34 meshing witha similar gear 35 fixed upon a shaft 36 rotatably mounted in' a bearing37 upon the base 1. Theshaft 36 also carries a stepped pulley38'arranged to receive a belt (not shown) extending over a similarpulley 39 fixed upon ashaft 40 carried in a bracket 41 fixed to one sideof the base 1. 40 also. carries a drive pulley 42 adapted to receivepower from any suitable source.

The upper part of the endless conveyer 19 is supported to travelhorizontally in a straight hne by means comprising, in this instance, arail 43 formed for convenience in ,sections, said sections being boltedto standards 44 rising from the basel. The lower half of said endlessconveyer runs through a channel 45 provided in the base 1.

The articles to be operated upon are placed upon the conveyer 19 b anoperator standing at the left-hand end oi the machine, Fig.1. After thearticle has been passed between the first two grinding disks and two ofits opposite faces have been ground, the

article is turned into position to present two other opposite faces tothe next succeeding gairofgrinding disks by means to be now i escribed.

Between adjacent-pairs of grinding disks are mounted casings 46, .saidcasings each having at its opposlte ends studs 47 slidably mounted inelongated openin s 48 formed in certain of the standards 44. uts 49turned assing the last air of The shaft i p upon the screw-threadedouter ends of said studs secure the casing 46 in adjusted position. Thecasing has a guide-way 50 therein through which the upper parts of theholders 20 travel. At the point 51 the ide-way 50 is enlarged to permitthe artic e passing through said guide-way to be turned. In thisinstance, the means for turning the article consists 'of a plunger 52slidably mounted in an opening 53 formed in the casing 46, the 0erativ'e end of said plunger extending into t e path of movement of thearticle passing through the guide-way. The plunger 52. has a stem 54which is slidably mounted in a screw plug 55 closin one end of theopening 53. etween the unger 52 and said screw is included a coiledspr1ng 56 yieldingly holding the plunger 52 into position. to engage t earticles passing through the guide-way 50.

In operation, the grinding dis s 7 and for operating the conveyer 19 Thegrinding disks of each pair of disks are adjusted in position toward oraway from each other according to the size of the article to be operatedupon, and said disks are placed at an angle with the line of movement ofthe articles suitable to produce the depth of cut desired. The firstpair of disks operates upon two opposite sides or faces of the article,t e plun er 52 between the first and second pairs of isks turns thearticle into position for two other of its opposite sides' to be actedupon by the second pair of disks, and so on for the remainder of theseries of operations. It will be seen that each disk constitutes meansfor holdin the article against the o posite disk.

disks the articles dro rom the holders 20 into a suitable receptac e(not shown).

The machine herein shown may be used in various ways and for a number ofpurposes. For example, each pair of operating members 7 may be ofdifferent character or quality from the others. The first pair ma begrinding disks adapted to make a roug out and the succeeding grindingdisks to make successively finer cuts, the positioning devices 46 52being removed or held'from action.

It is evident that the details of the several parts and mechanisms ofthe machine and their relative order or arran ement may-be varied inmany res ects wit out departing from the princlple o the invention.

I claim as my invention: 1

1. In a grinding machine, in combination, a grinding device; an endlessconveyer for carrying an article into contact with and past said device;and means for holding the article against said device, said device beingarranged at an angle with the ath of the article, the portion of thegrinding device which extends in the direction from which 'ter' power issupplied to rotate the article approaches being farther from the path ofthe article than the opposite portion of said device, whereby thearticle is gradually ground to the size determined by the position ofthe portion of the device last contacted by the. article. I

2. In a grinding or polishing machine, in combination, two oppositegrinding or polishing elements disposed-at an angle with relation toeach other; means for actuating said elements; and a conveyer forcarrying an article through the space between said elements from thewider to the narrower part of said space.

3. In a grinding or polishing machine, in combination, a supportingmember having a guide-wa therein; a block slidably mounted in saiguide-way and adapted for partial rotation therein; a screw; bearings onsaid sup orting member for said screw; a nut on 'sa1 screw, said nuthaving-a stem forming a ,pivot for said block; and a bearingin saidporti lock for said stem.

4. In a grinding or polishing machine, in combination, a base; bracketssecured in pairs to opposite sides of said base; means on each 0 saidbrackets for rotatably supof sai andro'tating said supporting means; aconveyer whee mounte at each end of said a grinding element; means oneach brackets for longitudinally moving therein; a block slidablymounted in said i guideway and provided with bearings; a shaft rotatablymounted in said bearings; a grinding element fixed to said shaft; meansfor rotating said shaft; an adjusting screw rotatably mounted in saidmember; a nut on said screw; a stem on said nut serving as a pivot forsaid block; and means for pivotally moving said block.

6. In a grinding or polishing machine, in combination, two pairs ofopposing grinding elements; means for carrymg an article through thespaces between said elements and from one air to the other; and meansfor turning sald article between said pairs of elements comprising amember havlng a guideway therein and a yieldingly mounted plungerextending into said guideway and i adapted to engage the article.

I FREDERICK N. GARDNER. Witnesses:

JoHN C. Roon, L. L. MILLER.

